Process for the production of hydrocarbons of the erythrene series.



UNITED STATES PATENT OFFICE.

KONRAD DELBRT TCK, 0F ELBERFELD, HUGO KOHLER, OF LEVERKUSEN, NEAR COLOGNE,

AND KURT MEISENBURG, OF ELBERFELD,

GERMANY. ASSIGNORS TO FARBEN- FABRIKEN VORM. FRIEDR. BAYER & CO., ELBERFELD, GERMANY, A CORPORA- TION OF GERMANY.

PROCESS FOR THE PRODUCTION OF HYDROCARBONS OF THE ERYTHRENE SERIES.

No Drawing To all whom it may concern:

Be it known that we, KONRAD DELBRtioK, HUGO KoHLER, and KURT MEISENBURG, doctors of philosophy, chemists, citizens of the German Empire, residing, respectively, at Elberfeld, Leverkusen, near Cologne, and Elberfeld, Germany, have invented new and useful Improvements in Processes for the Production of Hydrocarbons of the Erythrene Series, of which the following is a specification.

Ve have found that the technically very valuable hydrocarbons of the erythrene series, such as isoprene (beta-methyl erythrene), alpha-methylerythrene, alpha-alpha-dimethylerythrene, etc., which hydrocarbons bontaining the characteristic nucleus graphically represented:

can be obtained in a very simple manner by treating 1.3-glycols containing the characteristic nucleus c-c-c-c with a dehydrating agent, such as sulfuric acid, sulfonic acids or their acid or neutral salts, phosphoric acid, aluminium chlorid, metal salts, etc.

In order to illustrate the new process more fully the following example is given: 1.3- butandiol is heated in a suitable apparatus in such a way that the vapors pass through a tube filled with magnesium sulfate which is heated to 300-400 C. The gases escaping after this treatment contain c0nsiderable quantities of erythrene which are isolated from the mixture by physical or chemical methods.

From beta-methylbutane-1.3-diol piperylene and from alpha-alpha-dimethylbutane- Specification of Letters Patent.

Application filed December 6, 1912.

Patented Apr. 18. 1916.

Serial No. 735,282.

1.3-cli0l obtained.

Ve claim 1. The process of producing a hydrocarbon of the erythrene series which comprises bringing a glycol having at least four carhon atoms and having the nucleus alphaalpha-dimethylerythrene is into contact with heated magnesium sulfate, substantially as described.

2. The process of producing a hydrocarbon of the erythrene series which comprises bringing a glycol having at least four carbon atoms and having the nucleus KONRAD DELBRUCK. 1.3. HUGO K'OHLER. [L.s.] KURT MEISENBURG. [1 5.

Witnesses HELEN NUFER, ALBERT NUFER.

It is hereby certified that in Letters Patent No. 1,179,408, granted April 18, 1916, Upon the application of Konrad Dclbriick, of Elberfeld, Hugo Kohler, of Leverkiisen, near Cologne, and Kurt Meisenburg, of Elberfeld, Germany, for an improvement in Processes for the Production of Hydrocarbons of the Erythrene Series, errors appear in the printed specification requiring correction as follows: Line l4,'after the word as insert the Word and comma erythrmm; lines 41-42,

for the word piperylene read isoprene; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 23d day of May, A. D., 1916.

[SEAL] J. T. NEWTON,

' Acting Commissioner of Patents. Cl. 2324, 

